钠原子D_2线FADOF强磁场模型适用条件研究

Applying condition of strong field model for sodium D_2 transition FADOF

相比于法拉第反常色散滤光器(FADOF)的精确模型,强磁场模型的能级结构简单,可以给出一些解析表达式,但是只有当磁场较强时才近似成立。通过计算两种模型在相同参数下的钠原子D_2线透射谱,并将计算得到的谱型和实验数据进行比对,得出了强磁场模型的适用条件以及符合程度。当磁场小于0.1T时,两种模型中心透射谱的差别大于50%,而当磁场大于0.3T时,透射谱的差别小于5%。

Compared to the accurate model of Faraday anomalous dispersion optical filter（FADOF）, the energy level of strong field model is simple, so it can be used to give some analytical expressions. However, it is only valid when the magnetic field is strong enough. By solving transmission spectrum of the FADOF for sodium De transition by the two models, and testing these results by the experimental data, applying condition for the strong-field model is successfully found. When the magnetic field is less than 0.1 T, the transmission spectrmn difference of the two models is greater than 50%, and when the magnetic field is greater than 0.3 T, the difference is less than 5%.